[Users] R: Star disappear from grid

[Lorenzo Cipriani]

I noticed that the Hamiltonian constraint violation along the x-axis (y=0, z=0) (in the attached image, taken from the H.xy.h5 file), has a very peculiar shape, aligned with the stars profile. This is very wrong, am I right?
So, the problem is either in the EoS, more likely, or Lorene.

Lorenzo
________________________________
Da: Bruno Giacomazzo <bruno.giacomazzo at unimib.it>
Inviato: giovedì 18 gennaio 2024 15:13
A: Lorenzo Cipriani <lorenzo.cipriani at graduate.univaq.it>
Cc: users at einsteintoolkit.org <users at einsteintoolkit.org>
Oggetto: Re: [Users] Star disappear from grid

Lorenzo,
   I opened the hdf5 file you sent me and I indeed see the same problem (I attached a couple of snapshots). So it is not a problem of resolution. Did you check that hydro quantities and spacetime variables are initialized correctly (just in case there is a problem with the initial data file)?

Cheers,
Bruno


Il giorno gio 18 gen 2024 alle ore 14:55 Lorenzo Cipriani <lorenzo.cipriani at graduate.univaq.it<mailto:lorenzo.cipriani at graduate.univaq.it>> ha scritto:
Dear Bruno,

I increased the resolution so that the finest level now has a resolution of 7/2^5 = 0.21875 using a smaller coarse grid, but the output remains unchanged.

Please let me know your thoughts on this!

Best,
Lorenzo

________________________________
Da: Bruno Giacomazzo <bruno.giacomazzo at unimib.it<mailto:bruno.giacomazzo at unimib.it>>
Inviato: mercoledì 17 gennaio 2024 16:44
A: Lorenzo Cipriani <lorenzo.cipriani at graduate.univaq.it<mailto:lorenzo.cipriani at graduate.univaq.it>>
Cc: users at einsteintoolkit.org<mailto:users at einsteintoolkit.org> <users at einsteintoolkit.org<mailto:users at einsteintoolkit.org>>
Oggetto: Re: [Users] Star disappear from grid

Lorenzo,
    the perfectly cut away may be due to the fact that you may have had failures in con2prim on the finest levels (and maybe points got set to atmosphere), but the coarser levels were not computed yet. Your standard output reports indeed errors in c2p. You use 6 refinement levels and therefore all levels are at the same time every 2^(6-1)=32 iterations. At iteration 4 only the 3 most inner levels would be at the same.

   I would increase the resolution since your finest grid is using a resolution of 12/2^5 = 0.375 so that you have a resolution of at least 0.24 on the finest level (level 5) and check if this solves the problem.

Cheers,
Bruno


Il giorno mer 17 gen 2024 alle ore 15:41 Lorenzo Cipriani <lorenzo.cipriani at graduate.univaq.it<mailto:lorenzo.cipriani at graduate.univaq.it>> ha scritto:
Dear all,
my name is Lorenzo Cipriani, PhD student at the University of L'Aquila.

My goal is to simulate a BNS merger using initial data computed from Lorene and evolved according to the parameter file I have attached.
Cactus reads the initial data correctly, as you can see in the image "rhoxy_initial.png" but, immediately after, the stars practically disappear from the grid, perfectly cut away (see image "rhoxy_it4.png").

Does anybody have a hint on what might be happening? I have never encountered a behavior like this.

Thank you for your assistance,
best regards,
Lorenzo
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--

Prof. Bruno Giacomazzo
Department of Physics
University of Milano-Bicocca
Piazza della Scienza 3
20126 Milano
Italy

email: bruno.giacomazzo at unimib.it<mailto:bruno.giacomazzo at unimib.it>
phone: (+39) 02 6448 2321
web: http://www.brunogiacomazzo.org<http://www.brunogiacomazzo.org/>

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There are only 10 types of people in the world:
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--

Prof. Bruno Giacomazzo
Department of Physics
University of Milano-Bicocca
Piazza della Scienza 3
20126 Milano
Italy

email: bruno.giacomazzo at unimib.it<mailto:bruno.giacomazzo at unimib.it>
phone: (+39) 02 6448 2321
web: http://www.brunogiacomazzo.org<http://www.brunogiacomazzo.org/>

---------------------------------------------------------------------
There are only 10 types of people in the world:
Those who understand binary, and those who don't
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